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\(=-385\cdot149+385\cdot298-298\cdot149-298\cdot385-683\cdot851\)
\(=-683\cdot149-683\cdot851=-683000\)
B = ( 1024 . 10 . 15625 + 9765625 . 256 ) : ( 256 . 625+78125 . 32 )
=( 160000000+2500000000 ):( 160000+2500000)
= 2660000000 : 2660000
= 1000
B = ( 1.024 . 10 . 15.625 + 9.765.625 . 256 ) : ( 256 . 625+78125 . 32 )
B =( 160.000.000+2.500.000.000 ):( 160.000+2.500.000)
B = 2.660.000.000 : 2.660.000
B = 1.000
42*53+47*156-47*114
=47*(156-114)+42*53
=47*42+42*53
=42*(47+53)
=42*100=4200
1 10 . 4 11 + 1 10 . 8 11 − 1 10 . 1 11 = 1 10 . 4 11 + 8 11 − 1 11 = 1 10 .1 = 1 10
\(\left(5^{1995}-5^{1993}\right):\left(5.5^{1992}\right)=\left(5^{1995}-5^{1993}\right):5^{1993}=\left(5^{1995}-5^{1993}\right)\times\frac{1}{5^{1993}}\)
\(=\left(5^{1995}\times\frac{1}{5^{1993}}\right)-\left(5^{1993}\times\frac{1}{5^{1993}}\right)=\frac{5^{1995}}{5^{1993}}-\frac{5^{1993}}{5^{1993}}=5^2-1=25-1=24\)
C = 5 12 . 6 11 + 5 12 . 5 11 + 7 12 C = 5 12 . 6 11 + 5 11 + 7 12 C = 5 12 + 7 12 = 1
4 3.5 + 4 5.7 + 4 7.9 + 4 9.11 = 4 2 5 − 3 3.5 + 7 − 5 5.7 + 9 − 7 7.9 + 11 − 9 9.11 = 2. 1 3 − 1 5 + 1 5 − 1 7 + 1 7 − 1 9 + 1 9 − 1 11 = 2. 1 3 − 1 11 = 2. 8 33 = 16 33
F = − 2 7 . 5 13 − 9 15 − 2 7 . 8 13 F = − 2 7 . 5 13 − 3 5 − 2 7 . 8 13 F = − 2 7 . − 14 65 − 2 7 . 8 13 F = − 2 7 . − 14 65 + 8 13 F = − 2 7 . 2 5 = − 4 35
D = 4 9 . 8 15 + 4 9 . 7 15 − 4 9 D = 4 9 . 8 15 + 7 15 − 1 D = 4 9 .0 = 0
